The layer of the skin the provides a barrier against bacteria as well as chemical and mechanical injuries is the

Characteristics of the epidermis include

All of the following are true of epidermal ridges except that they

Answer-contain increased numbers of free nerve endings
What is true-
*interconnect with the dermal papillae
*cause ridge patterns on the surface skin
*produce patterns that are genetically determined
*extend to the dermis

While walking barefoot on the beach, Joe stepped on a thorn that penetrated through the sole of his foot to the dermis. How many layers of the epidermis did the thorn penetrate

The primary pigments contained in the epidermis are

An albino individual lacks the ability to produce

All of the following are true of the pigment melanin, except that it

Answer-decreases in concentration within cells during exposure to the sun
What is true-
*protects DNA front the damaging effects of UV radiation
*is produced by cells called melanocytes
*is usually some shade of brown or black
*is produced from the amino acid tryosine

Which layer contains most of the accessory structures

An intradermal injection is administered into which layer

Which tissue is located in the region labeled "2"

All of the following are true of the subcutaneous layer, except

Answer-*is attached to the dermis by a basement membrane
What is true-
*permits independent movement of deeper structures
*is well supplied with nerves that pass into the skin
*contains many blood vessels
*contains large amounts of adipose tissue

Variations in hair color reflect differences in the pigment produced by

Lanugo is found

If the papilla of a hair follicle is destroyed

Which statement about hairs is false

Answer- club hairs are ingrown hairs
what is true
*Terminal hairs are in the axilla
*A terminal hair can detach but remain in the hair follicle as a club hair
*Eyebrows are terminal hairs
*Vellus hairs are on the limbs of children until puberty

When the arrector pili muscles contract

Each of the following statements concerning hair is true, except one

Answer-scalp hairs grow consistently throughout life.
What is true
*Terminal hairs are heavy and darkly pigmented
*The cortex of the hair is composed of hard keratin
*club hair is hair that has ceased growing
*medulla is the soft part of the hair

Earwax is produced by ____glands

Merocrine sweat contains _____to protect against bacteria

The highest concentration of merocrine sweat glands is found

Each of the following statements concerning sebaceous glands and sebum's true, except one

Answer- most sebaceous glands are coiled tubular glands.
What is true
-Most sebaceous glands open into hair follicles
-sebum functions to lubricate the hair and skin
-sebum can function as an antibiotic

Which of the following happens if he body temperature rises above normal

Merocrine sweat glands

All of the following ae true of perspiration produced by merocrine sweat glands, except one

Answer-produces the body odor characteristic of "sweating"
What is true
*helps to prevent bacteria from colonizing the skin
*contains electrolytes and date products
*is more than 99% percent water
*helps cool the body when it evaporates